阵列宽带Lamb波在结构损伤检测中的应用
收稿日期: 2013-09-06
修回日期: 2013-10-26
网络出版日期: 2013-11-22
基金资助
国家自然科学基金（50905141）；高等学校博士学科点专项科研基金（优先发展领域）（20126102130004）；新世纪优秀人才支持计划（NCET-10-0078）；西北工业大学基础研究基金（NPU-FFR-JC20110258）
Application of Array Wideband Lamb Wave in Structural Damage Detection
Received date: 2013-09-06
Revised date: 2013-10-26
Online published: 2013-11-22
Supported by
National Natural Science Foundation of China (50905141); Research Fund for the Doctoral Program of Higher Education of China (Priority Developing Area)(20126102130004); Program for New Century Excellent Talents in University (NCET-10-0078); NPU Foundation for Fundamental Research (NPU-FFR-JC20110258)
阵列信号处理中的空间谱估计可以对信号源进行辨别和定位，于是通过采集在结构上布置的阵列传感器Lamb波信号用来检测损伤发生的位置。通常，大多数空间谱估计方法均以窄带信号为假定，在很多基于Lamb波的结构损伤检测中，为了减小频散特性的影响，大多数研究以Lamb波为窄带信号进行分析，但无限窄的激励信号是物理不可实现的。因此，其在多数情况下Lamb波信号并不符合窄带信号假定，更应被认为是一种宽带信号来进行处理。进而利用空间谱估计中宽带信号非相干子空间处理方法（Incoherent Signal Subspace Method，ISM）中阵列接收的宽带Lamb波信号进行处理，检测出结构发生单一损伤时的损伤位置。随后，当结构损伤与边界反射波有叠加时会引起损伤信号相干，采用宽带信号相干子空间方法（Coherent Signal Subspace Method，CSM）对损伤位置进行检测，得到了较好的结果。
张宇 , 闫云聚 , 余龙 , 王建强 . 阵列宽带Lamb波在结构损伤检测中的应用[J]. 航空学报, 2014 , 35(3) : 780 -787 . DOI: 10.7527/S1000-6893.2013.0444
Spatial spectrum estimation in array signal processing could be used to identify and locate the signal source, so the structural damage is detected by the Lamb wave received from sensor array on structure in this paper. Generally, most of spatial spectrum estimation research are under the narrow band signal assumption, meanwhile, Lamb wave propagation in most research is considered as a kind of narrow band signal in order to reduce the wave dispersion effects. However, Lamb wave signal should be modulated as a kind of wideband signal because of unrealizable infinite narrow signal excitation. Thus, incoherent signal subspace method (ISM) is applied in array Lamb wave wideband signal processing so as to locate single structural damage in this paper. Then, coherent signal subspace method (CSM) is used when two damages occur since the damage reflected signals are coherent. The damage detection results show excellent accuracy.
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